On Thu, Jul 07, 2011 at 09:31:24AM -0700, Lux, Jim (337C) wrote: > > On 07/07/2011 10:13 AM, Eugen Leitl wrote: > > > > > > http://www.techeye.net/chips/one-million-arm-chips-challenge-intel-bumblebee > > > > > > One million ARM chips challenge Intel bumblebee > > > > > > > Now say it like Dr. Evil: one MILLION processors. > > > > > > How long is it going to take to wire them all up? And how fast are they > > going to fail? If there's a MTBF of one million hours, that's still one > > failure per hour. > > > But this presents a very interesting design challenge.. when you get to this > sort of scale, you have to assume that at any time, some of them are going to > be dead or dying. Just like google's massively parallel database engines.. > > It's all about ultimate scalability. Anybody with a moderate competence > (certainly anyone on this list) could devise a scheme to use 1000 perfect > processors that never fail to do 1000 quanta of work in unit time. It's > substantially more challenging to devise a scheme to do 1000 quanta of work > in unit time on, say, 1500 processors with a 20% failure rate. Or even in > 1.2*unit time.
They do address som of that in ftp://ftp.cs.man.ac.uk/pub/amulet/papers/SBF_ACSD09.pdf It's also specific to neural emulation. These should tolerate pretty huge error rates without fouling up the qualitative system behaviour they're trying to model. -- Eugen* Leitl <a href="http://leitl.org";>leitl</a> http://leitl.org ______________________________________________________________ ICBM: 48.07100, 11.36820 http://www.ativel.com http://postbiota.org 8B29F6BE: 099D 78BA 2FD3 B014 B08A 7779 75B0 2443 8B29 F6BE _______________________________________________ Beowulf mailing list, Beowulf@beowulf.org sponsored by Penguin Computing To change your subscription (digest mode or unsubscribe) visit http://www.beowulf.org/mailman/listinfo/beowulf
